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paranoia
A common side-effect, usually for first time or early users, is anxiety, panic, paranoia and feelings of impending doom. However these effects disappear within hours. Reassurance and a supportive environment help.
There are also anecdotal reports of long-term users 'turning a corner' in their cannabis use, where they can no longer enjoy the experience as cannabis triggers paranoia and anxiety attacks.
In a recent study, between 10%-15% of people who smoked cannabis reported "paranoid" or "confused" feelings as a disadvantage of smoking cannabis. (2) And over 27% reported "anxiety" as a regular or occasional effect. Around 30% gave "negative experiences" as their reason for permanently quitting cannabis. (3)
schizophrenia
There is a lot of misinformation presented about cannabis and schizophrenia. There is general agreement that heavy cannabis use can precipate schizophrenic episodes in those with the disorder but there is no evidence that it can cause the underlying psychotic disorder. Heavy cannabis users can exhibit long-lasting toxic psychosis involving delusions and hallucinations that can be incorrectly and dangerously - diagnosed as a schizophrenic illness. (4)
If you have mental health problems, taking a drug - any drug - excessively is going to make your problems worse.
Bron :
http://www.thegooddrugsguide.com/cannabis/dangers.htm
